護理師評估一位接有胸腔引流系統的病人，哪項發現顯示系統運作正常？
A nurse is assessing a client with a chest tube connected to a closed-chest drainage system. Which finding indicates the system is functioning correctly?
- AThe chest tube is clamped during patient ambulation病人行走期間夾閉胸管
- BFluctuation of the fluid level in the water seal chamber✓ 正解水封瓶內液面出現波動
- CContinuous bubbling in the water seal chamber水封瓶內持續冒泡
- DNo drainage in the collection chamber after 24 hours收集瓶在 24 小時後無引流液
胸腔引流系統的水封瓶內液面隨呼吸波動（Tidaling），代表胸膜腔與系統壓力相通且無阻塞。若持續氣泡，代表氣胸未癒合或系統漏氣。嚴禁未經醫囑夾管，以免引發張力性氣胸。引流量依病情而定，不可單憑此判斷系統運作。
Fluctuation (tidaling) of the fluid level in the water seal chamber with respiration indicates that the pleural space and the system are in pressure communication and that the system is unobstructed. Continuous bubbling indicates an unresolved pneumothorax or a system leak. Clamping the tubing without a physician's order is strictly prohibited because it may cause tension pneumothorax. Drainage volume varies with clinical status and cannot, by itself, be used to assess system function.
台灣胸腔外科手術後管路照護較依賴外科醫師評估；美國常規由護理師執行系統完整性評估與拔管準備。